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Any reason(s) to buy a newer edition (2010/2006) versus an older edition (2003)? I know Stone v. Ritter is an important case from 2006 that it obviously wouldn't cover, but is there anything else I should be worried about?

Also, is anyone familiar with Cox & Hanzen hornbook on Corporations? If so, what are your thoughts? Any other supplement suggestions?

This is relevant to my interests.

Also, my BA prof's final is all multiple choice, so if anyone knows a good source for BA/Corps multiple choice questions, speak.